numerous: Belfast area, Tyrone, Ulster generally, Cork. A Scottish family who settled in Longford in 1620 - the name in Ulster is generally Scottish. It is also an anglicisation of Mac Firbhisigh (man of prosperity), a family of poets and historians attached to the Uí Fiachrach (Mayo-Sligo). They compiled the Book of Lecan in 1417. IF & SGG.